CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES

CORC > 理论物理研究所 > 中国科学院理论物理研究所 > 理论物理所科研产出 > 理论物理所1978-2010年知识产出

	CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES
	Zhang, Qing-Jun; Cheng, Ling-Mei; Wu, Yue-Liang; Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China
刊名	ASTROPHYSICAL JOURNAL
	2009
卷号	694 期号:2 页码:1402-1412
关键词	Universal Density Profile All-sky Survey Cosmological Consequences Matter Halos Models Component Parameters Supernovae Evolution Abundance
ISSN号	0004-637X
英文摘要	Utilizing the CLASS statistical sample, we investigate the constraint of the splitting angle statistic of strong gravitational lenses (SGL) on the equation-of-state parameter w = p/rho of the dark energy in the flat cold dark matter (CDM) cosmology. Through the comoving number density of dark halos described by the Press-Schechter theory, dark energy affects the efficiency with which dark-matter concentrations produce strong lensing signals. The constraints on both constant w and time-varying w(z) = w(0) + w(a)z/(1 + z) from the SGL splitting angle statistic are consistently obtained by adopting a two-model combined mechanism of a dark halo density profile matched at the mass scale M(c). Our main observations are that (1) the resulting model parameter M(c) is found to be M(c) similar to 1.4 for both constant w and time-varying w(z), which is larger than M(c) similar to 1 obtained in literatures; (2) the fitting results for the constant w are found to be w = -0.89(-0.26)(+0.49) and w = -0.94(-0.16)(+0.57) for the source redshift distributions of the Gaussian models g(z(s)) and g(c)(z(s)), respectively, which are consistent with the Lambda CDM at 95% C.L.; (3) the time-varying w(z) is found to be sigma(8) = 0.74: (M(c); w(0), w(a)) = (1.36; -0.92, -1.31) and (M(c); w(0), w(a)) = (1.38;-0.89, -1.21) for g(z(s)) and g(c)(z(s)), respectively; the influence of sigma(8) is investigated and found to be sizable for sigma(8) = 0.74-0.90. After marginalizing the likelihood functions over the cosmological parameters (Omega(M), h, sigma(8)) and the model parameter Mc, we find that the data of SGL splitting angle statistic lead to the best-fit results (w(0), w(a)) =(-0.88(-1.03)(+0.65),-1.55(-1.88)(+1.77)) and (w(0), w(a)) = (-0.91(-1.46)(+0.60),- 1.60(-2.57)+(1.60)) for g(z(s)) and g(c)(z(s)), respectively.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000264538900055
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5351]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qing-Jun,Cheng, Ling-Mei,Wu, Yue-Liang,et al. CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES[J]. ASTROPHYSICAL JOURNAL,2009,694(2):1402-1412.
APA	Zhang, Qing-Jun,Cheng, Ling-Mei,Wu, Yue-Liang,&Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China.(2009).CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES.ASTROPHYSICAL JOURNAL,694(2),1402-1412.
MLA	Zhang, Qing-Jun,et al."CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES".ASTROPHYSICAL JOURNAL 694.2(2009):1402-1412.